Ключевые слова: air, atmosphere, awareness, background, chemical, chimney, chimney smoke, chimneys, cleanliness, climate, climate change, cloud, contaminate, damage, dirty, ecology, economy, emission, emit, energy, environment, environmental, factory, fumes, gas, global, global warming, greenhouseeffect, grey, human, industrial, industry, landscape, ozone, pipe, plant, poison, polluting, pollution, problem solving, silhouette, sky, smog, smoke, smokestack, steam, technology, toxic, warming, water,